safe_create_leading_directories(): always restore slash at end of loop

Always restore the slash that we scribbled over at the end of the
loop, rather than also fixing it up at each premature exit from the
loop.  This makes it harder to forget to do the cleanup as new paths
are added to the code.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

sha1_file.c

@@ -108,8 +108,9 @@ int mkdir_in_gitdir(const char *path)
 int safe_create_leading_directories(char *path)
 {
 	char *next_component = path + offset_1st_component(path);
+	int ret = 0;
 
-	while (next_component) {
+	while (!ret && next_component) {
 		struct stat st;
 		char *slash = strchr(next_component, '/');
 
@@ -125,25 +126,20 @@ int safe_create_leading_directories(char *path)
 		*slash = '\0';
 		if (!stat(path, &st)) {
 			/* path exists */
-			if (!S_ISDIR(st.st_mode)) {
-				*slash = '/';
-				return -3;
-			}
+			if (!S_ISDIR(st.st_mode))
+				ret = -3;
 		} else if (mkdir(path, 0777)) {
 			if (errno == EEXIST &&
-			    !stat(path, &st) && S_ISDIR(st.st_mode)) {
+			    !stat(path, &st) && S_ISDIR(st.st_mode))
 				; /* somebody created it since we checked */
-			} else {
-				*slash = '/';
-				return -1;
-			}
+			else
+				ret = -1;
 		} else if (adjust_shared_perm(path)) {
-			*slash = '/';
-			return -2;
+			ret = -2;
 		}
 		*slash = '/';
 	}
-	return 0;
+	return ret;
 }
 
 int safe_create_leading_directories_const(const char *path)